Condensed Consolidated Statements Of Equity (USD $) In Thousands, except Share data	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Dividends in Excess of Earnings	Accumulated Other Comprehensive Income, net	Total Stockholders’ Equity	Noncontrolling Interests in Operating Partnership	Noncontrolling Interests in Consolidated Joint Ventures	Total Noncontrolling Interests
Balance as of December 31, 2014 at Dec. 31, 2014	$ 3,914,238	$ 1,048,121	$ 1,349	$ 3,970,439	$ (1,096,607)	$ (45,046)	$ 3,878,256	$ 29,191	$ 6,791	$ 35,982
Shares, Outstanding, Beginning Balance at Dec. 31, 2014			135,626,255
Conversion of units to common stock			1	856			857	(857)		(857)
Conversion of units to common stock (shares)			79,274
Issuance of unvested restricted stock, net of forfeitures (shares)			80,138
Common stock offering costs	(148)			(148)			(148)
Exercise of stock options	334			334			334
Exercise of stock options (shares)	8,001		8,001
Amortization of unearned compensation on share-based awards	4,967			4,967			4,967
Reclassification of vested share-based awards				(8,602)			(8,602)	8,602		8,602
Dividends declared on preferred stock	(18,455)				(18,455)		(18,455)
Dividends and distributions on common stock and common and incentive units	(117,859)				(115,419)		(115,419)	(2,440)		(2,440)
Distributions to noncontrolling interests in consolidated joint ventures, net of contributions	(99)								(99)	(99)
Net income	122,325				120,183		120,183	2,026	116	2,142
Other comprehensive income—foreign currency translation adjustments	(45,843)					(44,948)	(44,948)	(895)		(895)
Other comprehensive loss—fair value of interest rate swaps	(2,417)					(2,370)	(2,370)	(47)		(47)
Other comprehensive income—reclassification of accumulated other comprehensive loss to interest expense	818					802	802	16		16
Balance as of March 31, 2015 at Mar. 31, 2015	$ 3,857,861	$ 1,048,121	$ 1,350	$ 3,967,846	$ (1,110,298)	$ (91,562)	$ 3,815,457	$ 35,596	$ 6,808	$ 42,404
Shares, Outstanding, Ending Balance at Mar. 31, 2015			135,793,668